"You canker blossom!" 3 Shakespearean Insults
1949, "viscous substance," American English, apparently from Gunk, trademark for a thick liquid soap patented 1932 by A.F. Curran Co. of Malden, Mass.
[1932+; fr a trademark, Gunk, for a degreasing compound, and part of a cluster of nearly synonymous terms beginning with g]